nix-env --upgrade: show "downgrading" when doing so
nix-env --upgrade: show "downgrading" when doing so

It was strange to show "upgrading" when the version was getting lower.
This is left on "upgrading" when the versions are the same,
as I can't see any better wording.

ysangkok/nix,peti/nix,dezgeg/nix,rycee/nix,dtzWill/nix,dezgeg/nix,ehmry/nix,shlevy/nix,garbas/nix,peti/nix,rycee/nix,rycee/nix,garbas/nix,shlevy/nix,NixOS/nix,bennofs/nix,rycee/nix,NixOS/nix,dtzWill/nix,ysangkok/nix,vcunat/nix,layus/nix,zimbatm/nix,vcunat/nix,shlevy/nix,dezgeg/nix,bennofs/nix,NixOS/nix,peti/nix,ttuegel/nix,wmertens/nix,layus/nix,garbas/nix,vizanto/nix,layus/nix,vizanto/nix,vizanto/nix,rowhit/nix,wmertens/nix,pikajude/nix,ttuegel/nix,bennofs/nix,zimbatm/nix,ehmry/nix,zimbatm/nix,ysangkok/nix,layus/nix,peti/nix,dezgeg/nix,wmertens/nix,ehmry/nix,dtzWill/nix,garbas/nix,dtzWill/nix,vizanto/nix,rycee/nix,vcunat/nix,pikajude/nix,vcunat/nix,wmertens/nix,ehmry/nix,peti/nix,rowhit/nix,rowhit/nix,ttuegel/nix,garbas/nix,layus/nix,ehmry/nix,dezgeg/nix,dtzWill/nix,rowhit/nix,shlevy/nix,NixOS/nix,zimbatm/nix,pikajude/nix,ttuegel/nix,shlevy/nix,bennofs/nix,ehmry/nix,NixOS/nix